diff --git a/include/nitro/hw/ARM7/mmap_wram.h b/include/nitro/hw/ARM7/mmap_wram.h
index aa9a8e3..52e2e35 100644
--- a/include/nitro/hw/ARM7/mmap_wram.h
+++ b/include/nitro/hw/ARM7/mmap_wram.h
@@ -86,7 +86,7 @@ extern "C" {
 //#define HW_PRV_WRAM_RED_RESERVED_END    (HW_PRV_WRAM + 0xfc40)
 
 //---- offset in system reserved area (tentatively)
-#define HW_PRV_WRAM_SYSRV               (HW_WRAM_AREA_END - HW_PRV_WRAM_SYSRV_SIZE) // (HW_PRV_WRAM + HW_PRV_WRAM_SIZE - HW_PRV_WRAM_SYSRV_SIZE)
+#define HW_PRV_WRAM_SYSRV               (HW_PRV_WRAM + HW_PRV_WRAM_SIZE - HW_PRV_WRAM_SYSRV_SIZE) // (HW_WRAM_AREA_END - HW_PRV_WRAM_SYSRV_SIZE)
 #define HW_PRV_WRAM_SYSRV_OFS_INTR_CHECK2    0x00
 #define HW_PRV_WRAM_SYSRV_OFS_EXCP_STACK     0x10
 #define HW_PRV_WRAM_SYSRV_OFS_EXCP_STACK_END 0x1c